WO2020249625A1

WO2020249625A1 - Longitudinal adjustment mechanism, vehicle seat

Info

Publication number: WO2020249625A1
Application number: PCT/EP2020/066114
Authority: WO
Inventors: Peter Gregor; Thorsten Schuermann; Erik Sprenger; Juergen Stemmer; Andrej Sulak
Original assignee: Adient Engineering and IP GmbH
Priority date: 2019-06-14
Filing date: 2020-06-10
Publication date: 2020-12-17
Also published as: CN114007900A; EP3983261A1; JP2022538793A; US20220161692A1; JP7301176B2; PL3983261T3; EP3983261B1; CN114007900B

Abstract

The invention relates to a longitudinal adjustment mechanism (10), more particularly for a vehicle seat (1), the longitudinal adjustment mechanism (10) having at least one rail pair, which is formed of a first rail (12) and a second rail (14) that can be displaced relative to the first rail (12) in the longitudinal direction (x), wherein: the rails (12, 14) engage about one another to form an inner channel (16); a spindle nut (30) connected to the second rail (14) and a spindle (20) operationally connected to the spindle nut (30) are arranged in the inner channel (16); on one end of the first rail (12) a transmission (50) driven by a motor and interacting with the spindle (20) is arranged; the spindle (20) is screwed, by means of an outer thread (22) of the spindle (20), into an internal thread (56) of a worm gear (54) of the transmission (50), and the spindle (20) is conjointly connected by means of a fixing element (58) to the worm gear (54); the fixing element (58) is arranged coaxially to a spindle axle (A) of the spindle (20) and is pressed between an end portion (20a, 20b), more particularly a front end portion (20a), of the spindle (20) and the worm gear (54). The invention further relates to a vehicle seat (1) having such a longitudinal adjustment mechanism (10).

Description

LONG ADJUSTER, VEHICLE SEAT

The invention relates to a longitudinal adjuster, in particular for a vehicle seat, the longitudinal adjuster having at least one pair of rails, which is formed from a first rail and a second rail which is displaceable in the longitudinal direction relative to the first rail, the rails mutually engaging around one another to form an inner channel, with in the inner channel a spindle nut connected to the second rail and a spindle operatively connected to the spindle nut are arranged, with a gear driven by means of a motor and interacting with the spindle being arranged at one end of the first rail, the spindle being connected to a spindle by means of an external thread Internal thread of a worm wheel of the transmission is screwed in, and the spindle is connected to the worm wheel in a rotationally fixed manner by means of a fixing element. The invention also relates to a vehicle seat.

State of the art

From DE 10 2005 023 095 A1 a drive device for a

Motor vehicle seat known in a sliding device. The drive device for use with an automotive seat slide device comprises

mating fixed and movable rail members which can be moved between a forward position and a rearward position. The

Drive device comprises an elongated spindle, a spindle nut, a gear and a mounting device. The spindle defines a spindle axis and has a spindle thread extending in the longitudinal direction. The spindle nut can be securely attached to a first rail part and has an internal thread that can engage the spindle thread. The transmission can be connected to a different one Rail part are mounted and selectively rotates the spindle around the spindle axis.

The spindle of the drive device is provided with a spindle wheel which, in the assembled state of the drive device, extends outward through the spindle wheel openings of the movable rail part.

A longitudinal adjuster, in particular for a vehicle seat, is known from DE 10 2017 218 492 A1. The longitudinal adjuster has at least one pair of rails, which consists of a first rail and one relative to the first rail in

Is formed longitudinally displaceable second rail, wherein the rails engage around each other to form an inner channel. By doing

A spindle nut mounted on the second rail and a spindle operatively connected to the spindle nut are arranged in the inner channel, with a spindle which can be driven by means of a motor and which is connected to the spindle at one end of the first rail

cooperating gear is arranged. The spindle is mounted at a front end section of the spindle in the gear mechanism and at a rear end section of the spindle in a pivot bearing of the first rail. In the longitudinal direction in front of the spindle nut there is a first cross bar in a slot in the first rail

added, wherein the spindle is guided through an opening of the first cross bar without contact, in particular with the formation of a circumferential gap, a shoulder of the spindle being arranged at a distance from the first cross bar in the longitudinal direction, wherein in response to a predetermined force, for example in the event of a crash , in particular by a displacement of the first rail, the first cross bar is jammed between the first rail and the shoulder, and as a result a force from the first rail via the first

Cross bar, the shoulder, the spindle and the spindle nut can be derived from the second rail.

From DE 10 2006 035 437 A1 and JP 2007-126103 A, one is in each case

Longitudinal adjuster for a vehicle seat known which has a non-rotatable

Provides plug connection between a corrugated and thread-free section of a spindle and a correspondingly corrugated counterpart section of a worm wheel of a spindle drive. A longitudinal adjuster for a vehicle seat is known from DE 10 2011 004 143 A1 and WO 2016/150790 A1. The longitudinal adjuster each has at least one pair of rails, which is formed from a first rail and a second rail displaceable in the longitudinal direction relative to the first rail, the rails alternately engaging around one another to form an inner channel. In the inner channel are a stationary and rotationally fixed connected to the second rail and one operatively connected to the spindle

Spindle gear arranged. A longitudinal adjustment of the vehicle seat takes place by moving the spindle by means of the spindle gear.

From EP 3 492 312 A1 a longitudinal adjustment unit of a seat is in one

Motor vehicle known, comprising a housing with a through opening which is arranged along a longitudinal axis and has a first spindle opening and a second spindle opening. Furthermore, the longitudinal adjustment unit has a spindle which can be passed through the through opening along the longitudinal axis through the housing. The longitudinal adjustment unit has a spindle nut and a

Worm that drives the spindle nut and in the housing by a

is mounted on both sides bearing collar, wherein the spindle nut is rotatably and axially mounted in the housing in the longitudinal axis on both sides, wherein a

Spindle lock nut is provided, through which the spindle is non-rotatably connected to the spindle nut.

task

The invention is based on the object of improving a longitudinal adjuster of the type mentioned at the beginning, in particular providing a longitudinal adjuster with an increased load-bearing capacity and a corresponding vehicle seat. solution

According to the invention, this object is achieved by a longitudinal adjuster,

In particular for a vehicle seat, the longitudinal adjuster having at least one pair of rails, which is formed from a first rail and a second rail that is displaceable in the longitudinal direction relative to the first rail, the rails alternately engaging around one another to form an inner channel, one with the second in the inner channel Spindle nut connected to the rail and a spindle operatively connected to the spindle nut are arranged, with a spindle being driven by means of a motor and connected to the spindle at one end of the first rail

cooperating gear is arranged, wherein the spindle, in particular at an end section, preferably at a front end section, by means of an external thread of the spindle into an internal thread of a worm wheel of the

Gear is screwed in, and the spindle is rotatably connected to the worm wheel by means of a fixing element, the fixing element being coaxial with a

Spindle axis of the spindle arranged and between an end portion,

in particular the front end portion, the spindle and the worm wheel is pressed.

In that the fixing element is arranged coaxially to a spindle axis of the spindle and between an end section, in particular a front one

End portion, the spindle and the worm wheel is pressed, the spindle is rotatably connected to the worm wheel.

The spindle is preferably in an end section, preferably at a front end section, by means of an external thread of the spindle

Internal thread of a worm wheel of the gear unit screwed in. As a result, a connection with the worm wheel that can be loaded in the longitudinal direction of the spindle can be created, which enables a corresponding force transmission in the longitudinal direction.

Characterized in that the spindle rotatably by means of a fixing element with the

Connected worm gear is further a torque transmission to the Allows longitudinal axis of extension of the spindle from the worm wheel to the spindle.

The first rail can preferably be one that can be connected to a vehicle seat

Be seat rail, in particular head rail. The second rail can preferably be a floor rail that can be connected to a vehicle structure, in particular

Lower rail, be.

In response to a predetermined force, for example in the event of a crash, a force can be diverted from the first rail to the second rail via a gear holder, the gear, the spindle and the spindle nut.

The longitudinal adjuster can have a gear holder. The gear holder can have two legs parallel to one another. The two opposite legs are preferably connected to one another in a manner known per se via a web. A fastening section, by means of which the gear holder is held on the first rail, can be connected to each of the legs. The

Fastening sections can be bent by approximately 90 ° with respect to the respective adjacent leg. In the assembled state of the U-shaped gear holder, the gear can be accommodated between the legs. To provide a load-bearing connection between the gearbox holder and the first rail in the event of a crash, laterally protruding projections can be provided on the legs of the gearbox holder, which interact through corresponding recesses in a lateral section of the second rail.

The spindle can have a thread-free section at its front end section. The front end portion of the spindle may be threadless

Have portion and a portion with thread. The spindle may have a thread-free portion at a rear end portion. Rear

The end portion of the spindle may have an unthreaded portion and a threaded portion. The fixing element can be a positive connection of the spindle with the

Provide worm wheel. The fixing element can provide a non-positive connection between the spindle and the worm wheel. The fixing element can be a socket, in particular a hollow cylindrical socket. The fixing element can be a plastically deformed socket. The fixing element can be a bushing plastically deformed in an axial direction. The fixing element can be a bushing plastically deformed in a radial direction. The fixing element may be a bushing plastically deformed in an axial direction and in a radial direction. The fixing element can be a compression socket. The fixing element can be materially connected to the spindle and the worm wheel. The

Fixing element can be glued to the spindle and the worm wheel. The fixing element can be welded to the spindle and the worm wheel.

A rear end section of the spindle can be mounted in a pivot bearing in the first rail. A rear end section of the spindle can be mounted in the first rail by means of the thread-free section in the pivot bearing. In the area of the pivot bearing on the rear end section of the spindle, additional means for force dissipation can be provided, in particular in the event of a spot impact.

Such means are described, for example, in DE 10 2017 218 492 A1, the relevant disclosure content of which is hereby expressly included.

The external thread of the spindle can be designed in the form of a trapezoidal thread. The internal thread of the worm wheel can be designed in the form of a trapezoidal thread. The external thread of the spindle and the internal thread of the worm wheel can each be designed with two starts.

The object is also achieved according to the invention by a vehicle seat with a longitudinal adjuster according to the invention, in particular a longitudinal adjuster according to the description above. Figures and embodiments of the invention

Before refinements of the invention in more detail below with reference to

Figures are described, it should first be noted that the invention is not limited to the components described. Furthermore, the terminology used does not represent any restriction, but is merely exemplary

Character. Insofar as the singular is used in the description and the claims below, the plural is also included, unless the context explicitly excludes this.

The invention is illustrated below with the aid of one in the figures

advantageous embodiment explained in more detail. However, the invention is not restricted to this exemplary embodiment. Show it:

Fig. 1: a vehicle seat according to the invention,

Fig. 2: a longitudinal section of a longitudinal adjuster of the invention

Vehicle seat of Fig. 1,

3: a detail of an enlarged illustration of FIG. 2,

4: a gear holder with gear, a spindle and a fixing element in a first assembly state,

Fig. 5: the gear holder with gear, the spindle and the fixing element in

a second assembly state, and

Fig. 6: the gear holder with gear, the spindle and the fixing element in

a third assembly state.

A vehicle seat 1 shown schematically in FIG. 1 is described below using three spatial directions running perpendicular to one another. A longitudinal direction x runs in the case of an installed in the vehicle Vehicle seat 1 largely horizontal and preferably parallel to one

Vehicle longitudinal direction, which corresponds to the normal direction of travel of the vehicle. A transverse direction running perpendicular to the longitudinal direction x is also oriented horizontally in the vehicle and runs parallel to one

Vehicle transverse direction. A vertical direction z is perpendicular to the

Longitudinal direction x and perpendicular to the transverse direction. In the case of a vehicle seat 1 installed in the vehicle, the vertical direction z runs parallel to the

Vehicle vertical axis.

The position information and direction information used, such as front, back, top and bottom relate to a viewing direction of an im

Vehicle seat 1 seated occupants in the normal seating position, the vehicle seat 1 installed in the vehicle, in a suitable for passenger transport

Use position with upright backrest 4 and aligned as usual in the direction of travel. The vehicle seat 1 can, however, also be installed in a different orientation, for example transversely to the direction of travel.

The vehicle seat 1 shown in FIG. 1 has a seat part 2 and the backrest 4 whose inclination is adjustable relative to the seat part 2. An inclination of the backrest 4 can

be adjustable for example by means of a locking fitting or a gear fitting. The vehicle seat 1 is mounted on a longitudinal adjuster 10 for setting a longitudinal position of the seat.

FIG. 2 shows the longitudinal adjuster 10 according to the invention of the vehicle seat 1 from FIG. 1. The longitudinal adjuster 10 has at least one pair of rails, preferably two pairs of rails. The pairs of rails are each formed from a first rail 12, in particular for connection to a seat structure, and a second rail 14, in particular for connection to a vehicle structure. The rails 12, 14 of the pair of rails are displaceable relative to one another in the longitudinal direction x and reciprocally engage around one another to form an inner channel 16. A spindle nut 30 connected to the second rail 14 and a spindle 20 operatively connected to the spindle nut 30 are arranged in the inner channel 16. The

Spindle nut 30 is in the present case held fixed to the second rail 14, especially screwed. The spindle 20 extends along a spindle axis A parallel to the longitudinal direction x.

At a front end section 20a of the spindle 20, a gear 50 which can be driven by means of a motor (not shown) and interacts with the spindle 20 is arranged. The motor can be held on a motor carrier mounted between the two gears 50 of the respective rail pairs and can drive the two gears 50 by means of a shaft not shown in FIG. 2. The motor drives in particular a worm 52 which is rotatably mounted about a worm axis of rotation, by means of which a worm wheel 54 which is rotatably mounted perpendicular to the worm axis of rotation in a predetermined

Reduction ratio is drivable. The worm 52 and the worm wheel 54 are preferably received in a common gear housing. The worm wheel 54 has a central thread 56 having an internal thread

Section 54a and two bearing sections 54b adjoining the central section 54a parallel to the longitudinal direction x. At least the front bearing section 54b in the longitudinal direction x is designed to be thread-free.

The worm wheel 54 is provided to rotate the spindle 20 by one

To drive spindle axis A. The gear 50 supports the front end section 20 a of the spindle 20. A rear end section 20 b of the spindle 20 is supported in a pivot bearing 40 on the first rail 12.

3 shows an enlarged section of the longitudinal adjuster 10 in the area of the front end section of the spindle 20. The gear 50 is connected to the first rail 2 by means of a gear holder 60. The gear holder 60 has two legs 62 parallel to one another. The two opposite legs 62 are connected to one another in a manner known per se via a web 64. A fastening section 66 connects to each of the legs 62, by means of which the gear holder 60 is held on the first rail 12. The

Fastening sections 66 are bent by approximately 90 ° with respect to their respective legs 62. In the assembled state of the U-shaped gear holder 60, the gear 50 is received between the legs 62. In known devices for seat length adjustment, the

Fastening sections 66 usually have threaded bores, which in

Interaction with corresponding screws and / or threaded bolts bring about a connection to the first rail 12. The gear holder 60 can alternatively be welded or riveted to the first rail 12.

The spindle 20 is passed through one of the two parallel legs 62 of the essentially U-shaped gear holder 60. In the present case, the spindle 20 is formed by the rear leg 62 parallel to the longitudinal direction x

passed through. The spindle 20 is screwed at its front end section 20 a into the internal thread 56 of a worm wheel 54 by means of the external thread 22 of the spindle 20. The spindle 20 is non-rotatably connected to the worm wheel 54 by means of a fixing element 58.

4 shows the front end section 20a of the spindle 20, the fixing element 58 and an assembly, formed from the gear holder 60 and the gear 50, in a first assembly state in which the spindle 20 and the fixing element 58 are not connected to the assembly. The spindle 20 has at its front

End section 20a has a thread-free section 24.

5 shows a subsequent assembly state in which the spindle 20 is passed through the rear leg 62 of the gear holder 60, parallel to the longitudinal direction x, and is inserted into the shaft by means of the external thread 22 of the spindle 20

Internal thread 56 of the worm wheel 54 is screwed. The spindle 20 is screwed in through the internal thread 56 of the worm wheel 54 in such a way that the thread-free section 24 of the spindle 20 protrudes through the internal thread 56 into the bearing section 54b, in the present case protruding through it.

6 shows a third, in particular last, assembly state in which the spindle 20, previously screwed into the worm wheel 54, and the worm wheel 54 are connected to one another in a rotationally fixed manner by means of the fixing element 58. For this purpose, the fixing element 58 is from the front end section 20a of the spindle 20 in a previously empty area, between the thread-free section 24 of the spindle 20 and the thread-free section 24 enclosing bearing section 54b of the

Worm wheel 50, introduced, pressed in here. By pressing in the fixing element 58, the spindle 20 and the worm wheel 54 are connected to one another in a frictionally locking manner.

The features disclosed in the above description, the claims and the figures can be important both individually and in combination for the implementation of the invention in its various embodiments.

Although the invention has been described in detail in the figures and the preceding representation, the representations are to be understood as illustrative and exemplary and not restrictive. In particular, the choice is the graphic

The proportions of the individual elements shown should not be interpreted as necessary or restrictive. Furthermore, the invention is in particular not restricted to the exemplary embodiments explained. Further variants of the invention and their implementation emerge from the preceding for the person skilled in the art

Disclosure, the figures and the claims.

Terms used in the claims such as “comprise”, “have”, “include”, “contain” and the like do not exclude further elements or steps. The use of the indefinite article does not exclude a plurality. A single device can perform the functions of several units or devices mentioned in the claims.

List of reference symbols

1 vehicle seat

2 seat part

4 backrest

10 length adjusters

12 first rail

14 second rail

16 inner channel

20 spindle

20a front end portion (of the spindle 20)

20b rear end portion (of the spindle 20)

22 external thread

24 thread-free section

30 spindle nut

40 pivot bearings

50 gear

52 snail

54 worm wheel

54a central section

54b storage section

56 internal thread

58 fixing element

60 gear holders

62 legs

64 bridge

66 connecting section

A spindle axis (of spindle 20)

x longitudinal direction

z vertical direction

Claims

1. Longitudinal adjuster (10), in particular for a vehicle seat (1), the

Longitudinal adjuster (10) having at least one pair of rails, which consists of a first rail (12) and one relative to the first rail (12) in

A second rail (14) which is displaceable in the longitudinal direction (x) is formed, the rails (12, 14) mutually engaging around one another to form an inner channel (16), a spindle nut (16) connected to the second rail (14) in the inner channel (16). 30) and one with the spindle nut (30)

operatively connected spindle (20) are arranged, wherein at one end of the first rail (12) a gear (50) which can be driven by means of a motor and interacts with the spindle (20) is arranged, the spindle (20) by means of an external thread (22) the spindle (20) is screwed into an internal thread (56) of a worm wheel (54) of the gear (50), and the spindle (20) is non-rotatably connected to the worm wheel (54) by means of a fixing element (58),

characterized in that

the fixing element (58) is arranged coaxially to a spindle axis (A) of the spindle (20) and is pressed between an end section (20a, 20b), in particular a front end section (20a), the spindle (20) and the worm wheel (54).

2. Longitudinal adjuster (10) according to claim 1, wherein the spindle (20) at one of the end sections (20a, 20b), in particular at a front end section (20a), into the internal thread (56) of the worm wheel (54) of the transmission (50 ) is screwed in.

3. Longitudinal adjuster (10) according to one of claims 1 or 2, wherein in response to a predetermined force, for example in the event of a crash, a force from the first rail (12) via the gear (50), the spindle (20) and the spindle nut (30) can be derived from the second rail (14).

4. Longitudinal adjuster (10) according to one of claims 1 to 3, wherein the spindle (20) has a thread-free section (24a) at its front end section (20a).

5. longitudinal adjuster (10) according to one of claims 1 to 4, wherein the

Fixing element (58) provides a positive connection between the spindle (20) and the worm wheel (54).

6. longitudinal adjuster (10) according to any one of claims 1 to 5, wherein the

Fixing element (58) provides a non-positive connection between the spindle (20) and the worm wheel (54).

7. longitudinal adjuster (10) according to any one of claims 1 to 6, wherein the

Fixing element (58) is a socket.

8. Longitudinal adjuster (10) according to claim 7, wherein the fixing element (58) is a hollow cylindrical socket.

9. longitudinal adjuster (10) according to any one of claims 1 to 8, wherein the

The fixing element (58) is a compression sleeve.

10. Longitudinal adjuster (10) according to one of claims 1 to 9, wherein the spindle (20) has a thread-free portion (24b) at a rear end portion (20b).

11. Longitudinal adjuster (10) according to one of claims 1 to 10, wherein a rear end portion (20b) of the spindle (20) is mounted in a pivot bearing (40) in the first rail (12).

12. Longitudinal adjuster (10) according to claim 11, wherein a rear end section (20b) of the spindle (20) is mounted in the pivot bearing (40) by means of a thread-free section (24b).

13. Longitudinal adjuster (10) according to one of claims 1 to 12, wherein the external thread (22) of the spindle (20) and the internal thread (56) of the worm wheel (54) are designed in the form of a trapezoidal thread.

14. Longitudinal adjuster (10) according to one of claims 1 to 13, wherein the external thread (22) of the spindle (20) and the internal thread (56) of the worm wheel (54) are designed with two starts.

15. Vehicle seat (1) with a longitudinal adjuster (10) according to one of the

preceding claims.